Tap Water Quality Report
Tap water quality in EAU CLAIRE, Wisconsin
Tap water in EAU CLAIRE, Wisconsin receives a grade of D (65/100) from TapWaterSafety.org. It's served by EAU CLAIRE WATERWORKS. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Total PFOS and PFOA significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in EAU CLAIRE's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving EAU CLAIRE.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 10.5 ppt, 10500x above the EWG health guideline of 0.001 ppt.
Total PFOS and PFOA significantly above health guideline
Moderate concernTotal PFOS and PFOA detected at 7.3 ppt, 1043x above the EWG health guideline of 0.007 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 10.4 ppb, 174x above the EWG health guideline of 0.06 ppb.
EPA compliance record
Official U.S. EPA records for EAU CLAIRE WATERWORKS (system ID WI6180230) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for EAU CLAIRE
Filters matched to the specific contaminants in EAU CLAIRE's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in EAU CLAIRE's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
10.5 ppt | 0.001 | 10.0 | — | — | — | — | EPA violation |
| Perfluorooctane sulfonate (PFOS) PFAS |
4.38 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | EPA violation |
| Total PFOS and PFOA PFAS |
7.3 ppt | 0.007 | — | 100 | 100 | 0.007 | — | 1043× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
10.4 ppb | 0.06 | — | — | — | — | — | 174× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
23.2 ppb | 0.15 | 80.0 | 100 | — | — | — | 155× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
4.23 ppb | 0.1 | 60.0 | 60 | — | — | — | 42× over |
| Chloroform Disinfection byproduct |
16.2 ppb | 0.4 | — | — | — | — | — | 41× over |
| Trichloroacetic acid Disinfection byproduct |
2.45 ppb | 0.1 | — | — | — | — | — | 25× over |
| Perfluorooctanoic acid (PFOA) PFAS |
1.46 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 16× over |
| Chromium (hexavalent) Heavy metal |
0.306 ppb | 0.02 | — | — | — | — | — | 15× over |
| Bromodichloromethane Disinfection byproduct |
0.817 ppb | 0.06 | — | — | — | — | — | 14× over |
| Nitrate and nitrite Inorganic |
1.33 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 9.5× over |
| Dichloroacetic acid Disinfection byproduct |
1.78 ppb | 0.2 | — | — | — | — | — | 8.9× over |
| Nitrate Inorganic |
1.1 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 7.9× over |
| Radium, combined (-226 and -228) Radiological |
0.17 pCi/L | 0.05 | 5.0 | — | — | — | — | 3.3× over |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.108 ppb | 0.06 | 5.0 | — | — | — | — | 1.8× over |
| Chlorate Disinfection byproduct |
86.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Dibromochloromethane Disinfection byproduct |
0.0307 ppb | 0.1 | — | — | — | — | — | Below guideline |
| Trichloroethylene Volatile organic compound |
0.0718 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | Below guideline |
| Bromoform Disinfection byproduct |
0.048 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.661 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.52 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
2.8 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.9 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.75 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.395 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0498 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.571 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Nitrite Inorganic |
0.043 ppm | — | 1.0 | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from EAU CLAIRE WATERWORKS.